spud gunning/building spud guns is an art. not everyone can do it. therefor it belongs in an art museum.

that cannon looks cool, but i see no point, it would take probably 10 minutes to load it and take maybe a second to shoot it if they all fired at the same time.

Yes, but it's a different degree of art. It's not meant to be in the same building, let alone the same room as paintings. And that cannon could be modified for rapid fire. Although it may take some work.